In1620abouthalftheUSAwascovered（覆盖）byforests．Todaytheforestshavealmostgone．Alotofgoodlandhasgonewiththemleavingonlysand（沙地）．Chinadoesn'twanttocopy（

Question

In 1620 about half the USA was covered （覆盖） by forests ． Today the forests have almost gone ． A lot of good land has gone with them leaving only sand （沙地）． China doesn't want to copy （抄） the USA's example ． We're planting more and more trees ． We've built the " Great Green Wall" of trees across northern （北部的） part of our country ． The Great Green Wall is 7 000 kilometres long and between 400 and 1 700 kilometres wide ． It will stop the wind from blowing the earth away ． It will stop the sand from moving towards the rich farmland （农田） in the south ． More "Great Green Walls" are needed ． Trees must be grown all over the world ． Great Green Walls will m ake the world better ．

　 (   )1.In 1620 about ______ the USA was covered by forests ．

　　 A ． a third    B ． half    C ． two thirds    D ． a fourth

(   )2 ． A lot of good land has gone with ______ ．

　　 A ． sand       B ． water   C ． wind          D ． forests

　 (   )3 ． The Great Green Wall in China is ______ long ．

　　 A ． 7 000 kilometers      B ． 1 700 kilometers

　　 C ． 7 000 meters          D ． 400 kilometers

(   )4 ． Trees must be grown in ______.

A ． China      B ． the USA     C ． some countries    D ． every part of the world

Answer 1

1B  2D  3A  4D